Little League Rules Senior/Big League: Solid Wood
and Wood Composite Baseball BatsAll wood Handles will not be less
than fifteen-sixteenths (15/16) inches in diameter (7/8 inch for
bats less than 30") at its smallest part. The bat shall not
weigh, numerically, more than three ounces less than the length
of the bat (e.g., a 33-inch-Iong bat cannot weigh less than 30
ounces). All bats not made of a single piece of wood shall meet
the Batted Ball Coefficient of Restitution (BBCOR.50)
performance standard, and such bats shall be so labeled with a
silkscreen or other permanent certification mark. The
certification mark shall be rectangular, a minimum of a
half-inch on each side and located on the barrel of the bat in
any contrasting color. .

Beginning in 2018 all Youth League bats will have to meet new
standards to perform the same as wood bats. 2018 Rule Changes
So Just use Wood

Every young ball player should have their own all wood bat to learn
the proper way to hit a baseball

In the years to come hitting with wood bats always improves a hitters
skill and improves ball bat exit speed the true measure of a hitters
power

Little League Rules Senior/Big League: Solid Wood
and Wood Composite Baseball BatsAll wood Handles will not be less
than fifteen-sixteenths (15/16) inches in diameter (7/8 inch for
bats less than 30") at its smallest part. The bat shall not
weigh, numerically, more than three ounces less than the length
of the bat (e.g., a 33-inch-Iong bat cannot weigh less than 30
ounces). All bats not made of a single piece of wood shall meet
the Batted Ball Coefficient of Restitution (BBCOR.50)
performance standard, and such bats shall be so labeled with a
silkscreen or other permanent certification mark. The
certification mark shall be rectangular, a minimum of a
half-inch on each side and located on the barrel of the bat in
any contrasting color.